Effects of Static Magnetic Fields and Temperature Increase on 3D Magnetic Storage in Heated-Dot Magnetic Recording (Revised May 2021)

Using the Landau-Lifshitz-Gilbert (LLG) equation, we investigated the effects of static magnetic fields and increase in temperature on 3D magnetic storage in heated-dot magnetic recording (HDMR) in the write process. The recording medium of HDMR was assumed to have double recording layers in which the Curie temperature in the upper layer was lower than that in the lower layer. When the lower layer is recorded, the upper layer must be re-recorded. We then investigated the relationship between the spacing between recording layers and bit error rates. When the thicknesses of upper and lower layers were the same, the minimal spacing for recording nearly without error was 4 nm, thus achieving the critical static magnetic field values for recording different data in each layer.